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From 1e423276a24d7c895d196f9f10bf8c0b9155c633 Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Tue, 12 Feb 2019 16:58:16 +0100
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Subject: [PATCH] rules: add elevator= kernel command line parameter
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Kernel removed the elevator= option, so let's reintroduce
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it for rhel8 via udev rule.
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RHEL-only
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Resolves: #2003002
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---
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rules.d/40-elevator.rules | 20 ++++++++++++++++++++
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rules.d/meson.build | 1 +
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2 files changed, 21 insertions(+)
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create mode 100644 rules.d/40-elevator.rules
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diff --git a/rules.d/40-elevator.rules b/rules.d/40-elevator.rules
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new file mode 100644
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index 0000000000..dbe8fc81a4
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--- /dev/null
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+++ b/rules.d/40-elevator.rules
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@@ -0,0 +1,20 @@
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+# We aren't adding devices skip the elevator check
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+ACTION!="add", GOTO="sched_out"
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+
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+SUBSYSTEM!="block", GOTO="sched_out"
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+ENV{DEVTYPE}!="disk", GOTO="sched_out"
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+
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+# Technically, dm-multipath can be configured to use an I/O scheduler.
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+# However, there are races between the 'add' uevent and the linking in
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+# of the queue/scheduler sysfs file. For now, just skip dm- devices.
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+KERNEL=="dm-*|md*", GOTO="sched_out"
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+
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+# Skip bio-based devices, which don't support an I/O scheduler.
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+ATTR{queue/scheduler}=="none", GOTO="sched_out"
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+
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+# If elevator= is specified on the kernel command line, change the
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+# scheduler to the one specified.
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+IMPORT{cmdline}="elevator"
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+ENV{elevator}!="", ATTR{queue/scheduler}="$env{elevator}"
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+
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+LABEL="sched_out"
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\ No newline at end of file
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diff --git a/rules.d/meson.build b/rules.d/meson.build
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index c5c3590b29..7e0bd89200 100644
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--- a/rules.d/meson.build
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+++ b/rules.d/meson.build
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@@ -5,6 +5,7 @@ install_data(
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install_dir : udevrulesdir)
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rules = files('''
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+ 40-elevator.rules
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40-redhat.rules
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60-autosuspend.rules
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60-block.rules
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